Exhaust fan



FIG. 1 is a front left perspective view of an exhaust fan showing our new design;

FIG. 2 is front view of the design shown in FIG. 1 ;

FIG. 3 is a rear view of the design shown in FIG. 1 ;

FIG. 4 is a left side view of the design shown in FIG. 1 ;

FIG. 5 is a right side view of the design shown in FIG. 1 ;

FIG. 6 is a top view of the design shown in FIG. 1 ; and,

FIG. 7 is a bottom view of the design shown in FIG. 1 .

The broken lines shown in the figures are included for the purpose of illustrating portions of the exhaust fan and form no part of the claimed design. 

CLAIM The ornamental design for an exhaust fan, as shown and described. 